* fix(app): preserve loader behavior in retained panels
Keep the running footer mounted across panel switches. Inactive loaders stop their animation work, then realign to the original wall-clock phase before they become visible.
* perf(app): remove inactive loader wrapper worklet
* perf(app): pause hidden turn elapsed timers
* perf(app): reduce loader animation work
Keep one wall-clock-aligned clock for visible loaders and detach retained
hidden loaders without unmounting them. Preserve the 950 ms sequence and
reduced-motion behavior.
* fix(app): stabilize streamed chat rendering
Use deterministic Markdown AST keys and preserve unique row identities when an assistant message resumes after a tool. Keep native gesture and plan-card children correctly keyed to avoid unsupported Fabric reconciliation paths.
* fix(app): stabilize retained native panels
Keep retained workspace roots in a stable native order and make active
panels present in the selection commit. Hidden panels now stop expensive
subscriptions and animations without losing mounted state.
* fix(app): harden retained panel activity
